均一加熱された円〓の急冷に伴う熱応力並に残留応力に関する研究(昭和25年11月造船協会秋季講演会)

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In the previous papers, we have studied, theoretically and experimentally, the thermal and residual stresses under one and two dimensional stress distribution and followed up the causes of the residual stresses for each cases. In this report, let us deal with the shrinkage stresses of circular cylinders rapidly cooled in water from uniformly heated condition, as an example for the case of three dimensional stress distribution. To avoid the effects of the transformation stresses, we used the low carbon steel and the heating temperature was hold 600℃ under the transformation temperature. Three kinds of test cylinders were made, and the diameters were 40,50 and 60 mm respectively ; however the length of each ones was constant 150 mm. We measured the cooling temperature at the outer surface of the test cylinders and the residual stress distribution by Sachs'method. These results are plated Fig. 2 and 8 respectively. To analyse these experimental results, we calculated the temperature distribution at each moment as shown in Fig. 3,and obtained, by plastic calculation, the maximum plastic deformation, which will occur in some part during cooling. This maximum plastic deformation, components of which are expressed by gr, gt and g_z in this paper, becomes the cause of constraint to the residual stresses. The residual stress distrbution can be obtained as a special case of thermal stress during the cooling of the test cylinder by using the respective stress-strain relations for the elastic and plastic zone. The theoretical stress distribution is shown in Fig. 6,and the residual stress due to heating and cooling can be calculated theoretically with sufficient accuracy, not only for one or two dimensional stress distribution but for three dimensional one.
社団法人日本船舶海洋工学会の論文

均一加熱された円〓の急冷に伴う熱応力並に残留応力に関する研究(昭和25年11月造船協会秋季講演会)

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